按字符读写文件

#include<stdio.h>
#include<stdlib.h>
int main()
{   
	char ch;
	FILE *fp;
	**//判断文件是否成功打开** 
	//if((fp=fopen("demo.txt","w"))==NULL)
//	{
	//printf("Failure to open demo.txt!\n");
	//exit(0);
//	}   
	fp=fopen("demo.txt","w");
	if(fp==NULL)
	{
		printf("Failure to open demo.txt!\n");
      	exit(0);
	 } 
	     ch=getchar();
	     **//使用getchar()输入字符时，所有字符输入缓冲区
		 //直到键入回车换行符时将字符从该缓冲区中读出赋值** 

 

		 while(ch!='\n')**//键入回车换行符，结束键盘输入和写入** 
    {
 	    fputc(ch,fp);
     	ch=getchar();
    }
 fclose(fp);**//关闭文件** 
 return 0;
}

#include<stdio.h>
#include<stdlib.h>
int main()
{
	FILE *fp;
	int ch;
	if((fp=fopen("demo.txt","w"))==NULL)
	{
		printf("Failure to open demo.txt!\n");
		exit(0);
	}
	ch=getchar();
	while(ch!='\n')
	{
		fputc(ch,fp);
		ch=getchar();
	}
	fclose(fp);
	return 0;
}